20995903 has 2 divisors, whose sum is σ = 20995904. Its totient is φ = 20995902.

The previous prime is 20995889. The next prime is 20995939. The reversal of 20995903 is 30959902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20995903 - 2¹³ = 20987711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20995943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10497951 + 10497952.

It is an arithmetic number, because the mean of its divisors is an integer number (10497952).

Almost surely, 2^20995903 is an apocalyptic number.

20995903 is a deficient number, since it is larger than the sum of its proper divisors (1).

20995903 is an equidigital number, since it uses as much as digits as its factorization.

20995903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 37.

The square root of 20995903 is about 4582.1286538027. The cubic root of 20995903 is about 275.8744747056.

The spelling of 20995903 in words is "twenty million, nine hundred ninety-five thousand, nine hundred three".